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Inbox Zero vs Clean Email: catalog facts
Inbox Zero	Clean Email
Freemium Free to start, with paid and sales-led plans for more use.	Freemium Can be tried for free, with paid plans listed on the site.
Web	Android, iOS, Web
Automatic labelling and pre-drafted replies Bulk unsubscribe and cold email blocking	Bulk actions on grouped messages Smart folders and cleaning suggestions
Supports Google and Microsoft accounts only Mobile apps are not yet available	Requires granting a third-party service access to your mailbox Full use requires a paid plan
Web application, Hosted service	Downloadable app, Web application, Hosted service
Open source	Closed source
License not stated	License not stated
Account needed	Account needed
Needs internet	Needs internet
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.